class 泛型 {
    static void main(String[] args) {
        Student st = new Student();
        st.StudentID = 1;
        println(st.DisplayMarks());
    }
}

trait Marks {
    void DisplayMarks() {
        println("Marks1");
    }
}

trait Total extends Marks {
    void DisplayMarks() {
        println("Total");
    }
}

class Student implements Total {
    int StudentID
}